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L7986TATR

Public Made by Adom

by adom

STMicroelectronics DC-DC Converters, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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l7986tatr-hero.glb l7986tatr: hero GLB from the etched model (keeps the MPN mark) · Ray 21d ago
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page.json l7986tatr: specified limits as data (metadata.characteristics, 40 rows from the datasheet) · Ray 17d ago
README.md l7986tatr: specified limits as data (metadata.characteristics, 40 rows from the datasheet) · Ray 17d ago

L7986TATR

STMicroelectronics · DC-DC Converters · SOIC-8

L7986TATR from STMicroelectronics, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 OUT output Regulator output; the absolute maximum DC output voltage is -0.3 V to VCC.
2 SYNCH bidirectional Master/slave synchronization pin that carries a half-period phase-shifted signal when floating and synchronizes to an external higher-frequency signal with zero phase shift; the absolute maximum rating for this analog pin is -0.3 V to 4 V.
3 EN input Active-high enable that turns the device ON above 1.2 V and OFF below 0.3 V, with an absolute maximum range of -0.3 V to VCC.
4 COMP output Error amplifier output used for loop frequency compensation; the datasheet gives high-level output of 3 V (VFB < 0.6 V) and low-level output of 0.1 V (VFB > 0.6 V).
5 FB input Feedback input that regulates the output at 0.6 V when VOUT is connected directly, with an external resistor divider needed for higher voltages and an absolute maximum range of -0.3 V to 1.5 V.
6 FSW passive Switching frequency pin where an external resistor to ground raises the frequency, and a floating pin gives the free-running 250 kHz; the absolute maximum rating for this analog pin is -0.3 V to 4 V.
7 GND power_in Ground reference pin for the device.
8 VCC power_in Unregulated DC input voltage with an operating range of 4.5 V to 38 V and an absolute maximum of 45 V.

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package SOIC-8
Category Power Management (PMIC)
Pins 8

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Input voltage Vcc 45 V 5
Output DC voltage VOUT -0.3 V 5
Analog pin voltage (FSW, COMP, SYNCH) FSW, COMP, SYNCH -0.3 4 V 5
Enable pin voltage EN -0.3 V 5
Feedback voltage FB -0.3 1.5 V 5
Power dissipation HSOP8 PTOT 2 W TA < 60 °C 5
Junction temperature range TJ -40 150 °C 5
Storage temperature range Tstg -55 150 °C 5
Maximum thermal resistance junction ambient HSOP8 RthJA 40 °C/W Package mounted on demonstration board 5
Operating input voltage range VCC 4.5 38 V 6
Turn-on VCC threshold VCCON 4.5 V 6
VCC UVLO hysteresis VCCHYS 0.1 0.4 V 6
MOSFET on resistance RDSON 200 400 mΩ 6
Maximum limiting current ILIM 3.7 4.2 4.7 A TJ = 25 °C 6
Maximum limiting current ILIM 3.5 4.7 A 6
Switching frequency FSW 210 250 275 KHz 6
FSW pin voltage VFSW 1.254 V 6
Duty cycle D 0 100 % 6
Adjustable switching frequency FADJ 1000 KHz RFSW = 33 k 6
Feedback voltage VFB 0.582 0.6 0.618 V 4.5 V < VCC < 38 V 6
Quiescent current IQ 2.4 mA Duty cycle = 0, VFB = 0.8 V 6
Total standby quiescent current IQST-BY 20 30 µA 6
EN threshold voltage, device OFF level VEN 0.3 V Device OFF level 6
EN threshold voltage, device ON level VEN 1.2 V Device ON level 6
EN current IEN 7.5 10 µA EN = VCC 6
Soft-start duration TSS 7.4 8.2 9.7 ms FSW pin floating 6
High level output voltage VCH 3 V VFB < 0.6 V 6
Low level output voltage VCL 0.1 V VFB > 0.6 V 6
Source current COMP pin IO SOURCE 19 mA VFB = 0.5 V, VCOMP = 1 V 6
Sink current COMP pin IO SINK 30 mA VFB = 0.7 V, VCOMP = 1 V 7
Open-loop voltage gain GV 100 dB 7
Synchronization high input voltage VS_IN,HI 2 3.3 V 7
Synchronization low input voltage VS_IN,LO 1 V 7
Input pulse width tS_IN_PW 100 ns VS_IN,HI = 3 V, VS_IN,LO = 0 V 7
Input pulse width tS_IN_PW 300 ns VS_IN,HI = 2 V, VS_IN,LO = 1 V 7
Slave sink current ISYNCH,LO 0.7 1 mA VSYNCH = 2.9 V 7
Master output amplitude VS_OUT,HI 2 V ISOURCE = 4.5 mA 7
Output pulse width tS_OUT_PW 110 ns SYNCH floating 7
Thermal shutdown TSHDN 150 °C 7
Thermal shutdown hysteresis 30 °C 7

CAD (KiCad official)

  • Symbol: L7986TATR
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D, STEP)
  • 3D model files: l7986tatr-etched.step / l7986tatr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); l7986tatr.step / l7986tatr.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: STMicroelectronics datasheet (42 pp, sha256 6fbde02e437f5e16, retrieved 2026-10-12, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF